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O uso intensivo de conversores electronicos de potencia e de outras cargas nao lineares, tais como equipamentos electronicos e iluminacao com lampadas de descarga em meio gasoso, tanto na industria como nos outros consumidores em geral, e responsavel por um aumento na deterioracao das formas de onda de corrente e tensao nos sistemas electricos. Os filtros activos sao dispositivos electronicos de potencia capazes de compensar alguns dos problemas relacionados com a tensao e a corrente, nomeadamente: falhas de curta duracao, distorcao da corrente ou tensao causada por harmonicos, desequilibrio...

A compact presentation of the foundations, current state of the art, recent developments and research directions of all essential techniques related to the mechanics of composite materials and structures. Special emphasis is placed on classic and recently developed theories of composite laminated beams, plates and shells, micromechanics, impact and damage analysis, mechanics of textile structural composites, high strain rate testing and non-destructive testing of composite materials and structures. Topics of growing importance are addressed, such as: numerical methods and optimisation,...

A compact presentation of the foundations, current state of the art, recent developments and research directions of all essential techniques related to the mechanics of composite materials and structures. Special emphasis is placed on classic and recently developed theories of composite laminated beams, plates and shells, micromechanics, impact and damage analysis, mechanics of textile structural composites, high strain rate testing and non-destructive testing of composite materials and structures. Topics of growing importance are addressed, such as: numerical methods and optimisation,...